U of M Gardening Information: What's wrong with my plant?

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Crab Apple > Leaves > Rolled or deformed leaves

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Credit: Clemson Univ. Bugwood.org
Credit: UGA, Bugwood.org
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Powdery Mildew
Podosphaera leucotricha

Part or all of infected leaves are covered in white-gray, felt-like patches
Infected leaves will curl, twist, or fold upward
Infected blossoms are distorted, discolored, and covered in white powdery fungal growth
Infected fruit have bronze, corky streaks, that are skin deep
More information on Powdery Mildew...

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Credit: USDA Forest Service - Region 8 Archive, USDA Forest Service, Bugwood.org
Credit: Minnesota Dept. of Agriculture
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Obliquebanded Leafroller
Choristoneura rosaceana

Early season larvae feed on the undersurface of a leaf along the midrib or other large vein
Early season larvae feed inside bud clusters and developing fruit, resulting in fruit drop or corky scars on the fruit
Late season larvae can scar the fruit
Larvae are yellow-green and 1” in length when mature
Adult moth is reddish-brown with brown bands on the wings
More information on Obliquebanded Leafroller...

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Credit: Minnesota Dept. of Agriculture
Credit: Clemson University - USDA Cooperative Extension Slide Series, ,
Bugwood.org
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Redbanded Leafroller
Argyrotaenia velutinana

Larvae skeletonize leaves from the underside, folding and webbing the leaves together
Fruit injury is usually shallow with ragged edges and thick, corky tissue over the damaged area
Larvae are green with a green head, and reach about ½" at maturityLarvae are yellow-green and 1” in length when mature
Larvae are present early May – June
Adults have distinct red-brown bands on the forewings that form a V-shape when at rest, and are about ¼" in length

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